Question

Determine whether each pair is a conjugate acid-base pair. check all that apply. check all that apply. hcl, hbr nh3, nh+4 c2h3o−2, hc2h3o2 hco−3, no−3

Answer 1

Answer:
            Following are the conjugate acid-base pairs;

            1)  NH₃  ,  NH₄⁺

            2)  CH₃CO₂⁻  ,  CH₃COOH

Explanation:
                   According to Brønsted–Lowry acid–base theory an acid is any specie which can donate H⁺. When an acid donates proton it is converted into conjugate base.

Example:
                     CH₃COOH  +  BASE    →    CH₃COO⁻  + Base-H

In above reaction Acetic Acid (CH₃COOH) is acid, and after loosing proton it is converted into conjugate base i.e. Acetate (CH₃COO⁻).

And according to Brønsted–Lowry acid–base theory base is any specie which can accept H⁺. When base accepts proton it is converted into conjugate acid.

Example:
                                 NH₃  +  A-H    →    NH₄⁺  + A⁻

In above reaction Ammonia (NH₃) is a base, and after accepting proton it is converted into conjugate acid i.e. Ammonium (NH₄⁺)